Mark Hunter is a shy high school student who feels out of place in his suburban Arizona town. By night, he transforms into "Hard Harry," the charismatic and rebellious host of a pirate radio station. Using his station to share his frustrations with the world, Mark quickly gains a following among his fellow students, who are drawn to his raw honesty and anti-establishment views. His broadcasts cover everything from teenage angst to criticizing the school administration, resonating deeply with his peers and causing a stir in the community.

As the popularity of Mark's underground show grows, so does the tension between his dual identities and the pressure from school authorities to uncover the source of the disruptive broadcasts. Meanwhile, Nora, a fellow student and admirer of "Hard Harry," takes an interest in discovering the true identity behind the voice on the radio. The school's attempts to clamp down on Mark's free-spirited messages escalate, leading to a confrontation that challenges Mark to face the consequences of his actions and decide how far he's willing to go to stand up for what he believes.